Section 27905 Of Article 8. Signs From California Vehicle Code >> Division 12. >> Chapter 5. >> Article 8.

. It is unlawful to display on a vehicle any sign with the words "fire" or "fire department" thereon, except on vehicles owned and operated by a regularly organized fire department, fire district, forestry service, or the State Fire Marshal's Office, and on the privately owned vehicles of any regular member of any such fire departments.